Casing hook for drilling apparatus



May 5, 1925.

1,536,617 G. A. MoNTGoMERY CASING .HOOK FOR DRILLING APPARATUS Filed July 23, 1925 2 lSheeS--Sheet l @y @wv/90,@

May 5, 1925. 1,536,617

G. A. MONTGOMERY CASING HOOK FOR DRILLING APPARATUS Filed'l July 25, 1925 2 Sheets-Sheet 2 prove will edectively prevent undue wear or inw jury to thefthreaded ends ofthe casing or A Guerres n. non'rcoumnv, or rrruisvn, rnnn'svnvenm, .assrenon 'ro '.rrrus1 lll Gflllml- 15190K FUE DELEN@ PATUS.

. application med July 23, i923.` sexualite. 653,064.

To all 'whom it may concern:

. Be it lmown that l, GUsravns A. onr- GoMnur, acitizen of Finland, residing at Titusville, in the county of Crawford and 5 State of Pennsylvania, have invented new.

l employed for handling the casings or drill stems of drilling apparatus.

Its rincipal obJect 'is'to provide an imresilirent hookof this character which drill stems when screwing and" unscrewing lthe 2|. other object of the invention is tepro y vide a swivelcasing hook in which its center 2U of gravity 4is below the point of suspension.

'A further object isto provide the hook with novel mechanismfor regulating its .resilient or cushioning action. f

` still further object of the invention is 25 theprovision of means for locking or throwing the resilient mechanism 'out of action,

whereby the hook may be used in connection with rotary water swivel tools and the like.

vOther features ofthe invention consists in.

3Q the arrangement and construction of. parts hereinafter `more Afully described and,` articnlarly pointed out 4in the appendedclauns.

In the accompanying drawings: 1` `Figure 1 is a s1d e elevation of the 'im- 35- proved hook'connected to thewell casing.v Figure 2 is an enlarged.v vertical sectiona thereof, showing thehookin its normal elevated position. Figure. d is a verticalsec-- tion on line 3 3, Fig. 2, showing the hook 40 in'itsextended operative position. llignnaflgn is a horizontal section on line 4 4, Fig..2.

Figure v5 is a sectional detail view showing the means for locking the relatively movable.l parts of the hook together. Figure 6 is a et sectional side elevation of. a modified form of the improvement. Figure 7 is a vertical section thereof on line 7 7, Fig. 6. Fi re ,8 is a to` plan view'of the bail or c evis shown in igs. 6 and?. Figure 9 is a fragen mentary sectional side elevation of the casing hook, showing a modied form of safety latch. Flgure 10`is`a transverse vertical section on line 1 0-10, Fig. 9.

coupling joints thereof. Y'

Similar characters of reference indicate corresponding parts throughout the several views.

lin the embodiment ofthe invention shown in Figs. 1-5, inclusive, the numeral 10 indicates generally the casing hook from which is suspended the customary elevator 11 attached tothe upper end of the sectional well casing 12, two of suchsections being shown in the drawings which are usual threaded coupling 13.

'lhe improved casing hook is adapted to be supported from the dei-ick, not shown, and for this purposeis provided at its upper end with a detachable bail or clevis 14 connected toa cross-head'15 by a pin 16 from which the casing hook'is pivotally suspended. Attached to and depending from the crosshead lis a supporting or suspension member lin the form of a guide stem or rod 17 which is provided at its lower end-with a piston 18 preferably somewhat larger in cross section than saidrod. A swiveli'ng hook member or cylinder 19 is fitted or telescoped over the guide stem and piston for a limited- Ayielding movementlengthwise thereof. The

upper end of this cylinder is provided with an internal screw-thread 20 for receivin the externally-threaded end 21 of a hollow ead orcap 22 having ano ening 23 in its top through which the 'gulde stem 17 extends. At its closed lower end said cylinder terminates ina suspension hook 24. Fitted over the lower end of the ide'stem and resting joined by the eoV f on the upper side ofits piston 18 is a roller bea-rin preferably consisting of up er and lower earing'rings 25 containing caring ro s 26,' the purpose of this bearing being topermit a free s wiveling action of the hook `.member 'relatively to the suspension rod.` A, 'compression spring 27 is applied to the suspension lrod and bears` at its vlower end against 'the` roller bearing and at` its up er end against the end of the cap 22, it belngthereby' relieve. the strain on` the threaded Jomt of the casing sections in the act of unscrewing the4v couplingl. It will 'be of course understood, thttfthe expansion force ies exerted by this spring is suiic-ient to overcome the weight of the well casing.

For the purpose of permitting the device to function properly and also to expel any air which might be present in the cylinder 19, vents 28, 29 are provided in the bottom of said cylinder and in the cap 22 thereof,

v respectively.

- provided with packing rings 31.

The downward movement of the hook member 19 is limited by the upper bearing ring 25. abutting against a downwardlyfacing shoulder 32 formed bythe end ofy the cylinder-cap 22, thereby protecting the spring 27 against breakage.

By this construction and arrangement, a `resilient casing hook is provided in which its center of gravity is arranged below the suspension pin 16, none of the operative parts of the hook extending above this point.

Means are preferably provided for strengthening the hook 24 and for preventing accidental displacement of the elevator 11 therefrom. To this end, substantially upright reinforcing straps or tie bars 33 are employed) which are located at opposite sides of the hook and extend across its open end. As shown in Figs. 2 and 3, these straps may be provided at their ends with projections 34 which engage corresponding sockets 35 in the opposite sides of the hook, bolts 36 serving to fasten said straps thereto.

rlhe application of the hook for suspending the well casing is shown in Fig. 1, the

weight of the casing causing the compression of the spring 27 and the combined column of air and oil serving to retard and cushion the downward movement of the hook member relative to the suspension rod. lThe downward movement of said hook member is arrested by the lower end of the Cap 22 thereof abutting against the upper bearing' ring 25, which, together` with the supporting rod- 17 and piston 18 sustains the weight of the well casing at a point below the pin 15, that is, the suspension point of the hook. When one ofthe couplings 13 of the casing 12 is unscrewed, the spring 27 exerts the necessary expansion force to relieve the screw threads of the load imposed thereon to permit of disconnecting the icas ing-section without undue wear or damage to the threads, the roller bearings 26 allowing the free rotation of the hook and cas- 'his casing hook is readily applicable for use with rotary water swivel tools and the maaar? like, which do not'necessitate the use of a spring suspension. For this purpose, means are provided for detachably locking the hook-cylinder 19 with the suspension rod 17. As shown in Fig. 5 of the drawings, this means preferably consists of a transverse locking pin 37 adapted to engage alining openings 38, 39 formed in the sides .of said cylinder and in the piston 18, respectively. These openings are so located, that, in the normally elevated position, of the hook-cylinder shown in Figs. 2 and 5, they are in proper register to `permit of the insertion or removal of the locking pin. By this arrangement` the load is removed from the bearing 25, 26, and borne by the suspension rod and piston.

ln attaching this casing hook to the sheave-block of the derrick, the use of the well-known C-hook is eliminated, inasmuch as the clevis 14 of the hook is detachable therefrom by removing the pin 16, after which said clevis may be connected to the corresponding clevis of the sheave-block and the parts again assembled.

ln the embodiment of the invention shown in Figs. 6-8, inclusive, means are included for regulating the venting of the cylinder -and the construction of the hook-clevis is somewhat modified. The piston 40 is provided with a reduced skirt 41 which.fits loosely in a reduced bore 42 formed in the lower end of the cylinder 43. the latter and said piston being provided with alining openings 44, .45; respectively. seated in the. cylinder openings 44 are plugs -46, each containing an annular row of vent ports 47 regulated by an 'adjustable disk-valve 48 having a corresponding row of ports 49 adapted to reg ister more or less with said vent ports for controlling theadmission and expulsion of air to and fromy the lower portion of the cylinder. Each valve disk is provided with a threaded stem 50 having a head 51 for turning it and a nut 52 for locking it in a set position. rlhe venting of the upper end of the cylinder is effected by providing that portion of the cylinder cap 53 through which the connecting rod 54 extends with a packing` 55 and an adjustable packing n`ut' 56.

The hook clevis, in this instance, is constructed 'of' two symmetrical half sections 57 each mortised out at its upper end, as shown at 58, to provide a lap joint, the same being detachably' connected by bolts 59 or similar fastenings. The meeting faces of the upper portions of these sections may be provided with recesses forming a slot for receiving a centering key 61. The cross head 62, to which the rod 54 is connected, is provided at its ends with trunnions 63 with which the lower ends of the clevissections are adapted to removably engage.

Removably rl'his construction of clevis also eliminates the use of the customary C-hook, it being only necessaryl to-separate the .devis-sections and remove one of them from the respective -cross head trunnions to effect its attachment to the sheave-block clevis.

lnl Figs. 9 and l0 is shown a modified vform ofvretaining strap-or safety latch for preventing accidentalA displacement of theelevator 11 from the hook 24a. This safety latch, designated generally by the numeral ly-facing shoulder 7l located adjacent the open end of the hook. In its open position, shown by dotted lines in Fig. 9, the latch is vadapted to disappear into the body of the hook, and for this purpose, the latter is provided with a forwardly-facingv recess or' pocket 72 to receive it. Extending freely throu h openings 73 in the hook and in threa ed engagement with the latch-knuckle 65 are cppositely-disposed transverse pivot bolts 7d whose ends abut against each other and are locked to said knuckle by a pin 75 *or similar fastening. rlhe heads of the bolts may be provided with handles 76 by means of which the latch may be conveniently svvun out of its`closed position.

l c aim as my invention:

l. d casing hook ot( the character described, comprising a pair of relatively movable members, one beingvformed with a piston and the other in the form of a cyl- Inder "engaging said piston, a casing hook carried by one of said members and capable of swivelmg relatively to the other member,

yieldable meansV for resisting movement of said members out of their normal contracted position, and anti-friction devices interposed between the opposing ends ci said relatively movable members and applied to one of the latter, said devices being operative in the expanded position of said menu bers to permit a free swiveling action or one member on the other. 1

Q. A casing hook of the, character described, comprising a' pivotally-suspended "guide stem terminating at its lower end in a piston, a movable cylinder' for said piston vprovidedat its lower end with a hook,

a compression spring applied to said guide stem between said piston and the head "of l 'said cylinder, and a resistance medium contained in the latter for retarding the action of the spring and for restraining the move-r ment of the cylinder relativetoethe guidestem and its piston. v i

d. A casing hook of the character dcscribed, comprising a pendant supporting member having a piston, a revolving hookcarrying member including a cylinder guided on said supporting member and the piston of said cylinder having a part ar-J ranged to engage the upper side 'of said bearing in its extended position to permit a free swiveling action of the hook-carrying member relative tothe supporting member, yfor movement relative thereto, an anti-friction bearin supported by said piston, and a compresslon spring applied to the.' supporting member and bearing at its ends against said bearing and the head el said cylinder. f

d. A. casing hook ci the character described, comprising a pendant supporting member having a piston, a revolving hookcarrying member including a cylinder guided on said supporting member and its piston tor movement relative thereto, a removable. head tor said cylinder, an antifriction bearing supported by said piston, said head having a downwardly-facing stop shoulder adapted to abut against said bearing and permit tree rotary movement of the hook-carrying member in its extended position, and a compression `spring applied to, said supporting member between said bearing andthe cylinder-head.

A5. A 'casing hook ci the character described, comprising a pendant supporting 'member, a hook-carrying member guided on said supporting memberior movement relalen tive thereto, resilient means interposed between said members, respectively, lor resisting movement oi .the hook-carrying member out ci its normally elevated position, and means for locking said members together as ya unit, whereby said resilient meanspis rendered inoperative.

6. A casing hook oi thev character de scribed, comprising a pendant supporting member, a hook-carrying member guided on said supporting member for movement relative thereto, resilient means interposed between said members, respectively, for resisting movement of the hook-carrying member out oit its normally elevated position, said members having openings arranged to register with each other in suclt Anormally elevated position, and a locking pin ar` ranged for engagement with said openings.

ci GUSTWS-. MONTGOMERY.

ne ,p

Certiicate of @erreetiona It is hereby certified thetin Letters Patent No. 1,536,617, granted May 5, 1925, upon the application of Gustavus A. Montgomery, of Titusville, Pennsylvania, for an improvement in Casing Hooks and Drilling Apparatus, errors appear in the printed specification requiring correction as follows; Page 3, claim 3, line 73, commencing With the Word of strike outall to and including the Word and comma member,; in line 7 8, and line 79, after the Word piston insert the o lause said cylinder having a part arranged a engage the upper side 0f said bea/ring* n its extended position to per-mt a free swve'eZ-ng action of the hook carrying' member1 rela-tive 250 the supporting memberg; and that the seid Letters Patent should be read with these corrections therein that the same may conormto the record ofthe case in the Patent Office.

Signed and sealed this 2d clay of June, A. D. 1925. Y.

[SEAL] n y KARL FENNNG,

Acting Commissionerof Patents. 

